TW472125B - Sodium-based dechlorinating agent, flue gas dechlorinating method using the same and waste treatment equipment - Google Patents

Abstract

A sodium-based dechlorinating agent g is added to a flue gas G6; hydrogen chloride contained in this flue gas is removed as residue of dechlorination; the thus removed residue of dechlorination is dissolved by adding water i; water-insoluble constituents k are separated from the resulting aqueous solution j; and after adjusting pH of the aqueous solution 1 remaining after separation of the water-insoluble constituents k, mercury, dioxin and the like are removed and discharged. The sodium-based dechlorinating agent g is mixed with a hydrophilic anti-caking agent, with an angle of repose of 40 DEG or more, a dispersibility of less than 50, and a floodability index value of less than 90. A mean particle diameter of sodium hydrogencarbonate is set within a range of from 2 μm to 30 μm. The hydrophilic anti-caking agent comprises silica, and is contained in an amount of 0.1 mass % or more in the sodium-based dechlorinating agent. Further, a mean particle diameter of the hydrophilic anti-caking agent is set within a range of from 0.001 μm to 1 μm. This permits inhibition of occurrence of a pressure drop and leakage in the filter cloth of the dust collector.

Description

472125 A7 B7 V. Description of the invention (.1) Background of the invention: 1. Field of invention: (Read the precautions on the back before filling out this page) The present invention relates to a sodium-based dechlorinating agent and a dechlorinating agent using the same Flue gas dechlorination method and a waste treatment equipment. 2 · Description of related technologies: A treatment device for a flue gas containing hydrogen chloride, for example, a waste treatment device for sending waste to incineration. In this waste treatment equipment, the first dust collector and the second dust collector are arranged in sequence. After the first dust collector removes dust such as fly ash contained in the flue gas, the second dust collector Dechlorination of flue gas in a dust collector. For dechlorination in the second dust collector, a dechlorinating agent is added before the flue gas enters the second dust collector. In the past, calcium-based dechlorinating agents such as calcium hydroxide (C a (Ο 消费) 2 printed by the Industrial and Commercial Bureau of the Intellectual Property Bureau of the Ministry of Economic Affairs) were mainly used as dechlorinating agents. If calcium hydroxide is added to the flue gas, It will react with hydrogen chloride (HC 1) in the flue gas, and the dechlorination residue produced contains calcium chloride (C a C 1 2), calcium oxide C a 0) and the like. However, the use of the resulting dechlorinated residues lies only in the narrow and effective use of calcium chloride as a snow solvent or moisture absorbent. Most of the dechlorination residues are chemically treated or cement solidified > and disposed of by recycling, however, it has become increasingly difficult to obtain recycling sites. Therefore, it is recommended to use a sodium-based dechlorinating agent such as sodium bicarbonate (sodium bicarbonate: Na a Ή C 0 3). Or sodium carbonate (soda ash: Na 2 C ◦ 3) 'instead of a calcium-based dechlorinating agent. In this way, when the sodium-based dechlorinating agent is added to the flue gas: ‘the hydrogen chloride contained in the flue gas will become sodium chloride (N a C 1)’. Sodium chloride may be dissolved by adding water to the dechlorination residue. Therefore, the paper size of the water-soluble group dissolved in water applies the Chinese National Standard (CNS) A4 specification (210X297 mm) -4-472125 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (2) It can be diluted and discharged, and the insoluble components insoluble in water are separated and sent to a melting furnace for combustion treatment. Therefore, the need for disposal to recycling can be reduced. When sodium bicarbonate is used as a sodium-based dechlorinating agent and the particle size of the sodium bicarbonate is greater than 30 // m, the powder particles will not be cemented, and the agent is very stable in the powder state. However, sodium bicarbonate with a particle size larger than 30 / m leads to a very low removal rate of hydrogen chloride, so it is not appropriate to use it as a dechlorinating agent. Therefore, when sodium bicarbonate is usually used as a sodium-based dechlorinating agent, it is honed to a particle size of 30 μm or less. However, when honing sodium bicarbonate to a particle size of 30 # m or less, the powder particles will cement to form a fibrous dust ball or a block like a stone. The honed sodium bicarbonate cannot be used as a powder. Stability exists, making it impossible to stably supply it to the flue gas. To solve this disadvantage, a common method is to use an anti-caking agent. In the conventional art, a hydrophobic anti-caking agent has been used as an anti-caking agent, and the hydrophobic anti-caking agent brings a significant curing inhibiting effect. Sodium bicarbonate added with a hydrophobic anti-blocking agent has the characteristics of high flowability and flowability, and exhibits satisfactory stability in a powder state. However, when sodium bicarbonate added with a hydrophobic anti-caking agent is added to the flue gas as a dechlorinating agent, particles (that is, neutralized residues) and anti-caking generated by the reaction with sodium hydrogen carbonate after calcination. Both of the granules of the agent have high flowability and are easily stuck in a filter cloth attached to a second dust collector, which contains, for example, a bag type dust collector. When the neutralized residue particles or anti-caking agent particles penetrate into the filter cloth, agglomeration will occur. When the filter cloth causes the paper size to meet the Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read the precautions on the back before filling out this page) Equipment—1— Order ·! I!-«^, -5- 472125 A7 V. Description of the invention (more than 3 pressure drops make it impossible to continue operation. Even if the dust collector is backwashed, it is still difficult to get rid of agglomerates. Furthermore, Some particles after calcination with sodium bicarbonate (that is, the neutralized residue) will block the particles of the blocking agent through the filter cloth, resulting in dechlorinating agents and double-woven glass cloth commonly used as filter cloth. Leakage 'requires the use of a special filter cloth made of Teflon thin on the surface. However, if this film is used, a new problem arises when chemicals leak from this part. The purpose of the present invention is to avoid excessively high pressure filter cloth Summary of the invention: In order to solve the above problem, the present invention improves the sodium-based dechlorinating agent. More specifically, the sodium-based dechlorinating agent of the present invention contains sodium bicarbonate and a hydrophilic anti-caking agent. Mixtures with a static angle of 40 ° or higher, a dispersion of less than 50, and a floodability index of less than 9'0. Pulses of air-to-bag hydrogen chloride printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs The reaction is generated in the filter cloth, and the Leakage of leftovers. Chlorine and double woven glass cloth that neutralize the residual film are damaged or peeled off, face down or attach to the dust collector (please read the precautions on the back before filling this page). Sodium-based dechlorinating agent, in which the hydrophilic anti-caking agent has slight adhesion, and the flowability of sodium bicarbonate and anti-caking agent particles becomes relatively slow: sodium bicarbonate or anti-caking agent particles will not enter Into the filter cloth, and a stable filter layer is formed on the surface of the filter cloth. As a result, it is possible to prevent excessive pressure drop or filter cloth leakage in the filter cloth. Use PT-D powder test made by Hosokawa Micron company Machine, measuring physical properties. This paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) -6- 472125 A7 B7 V. Description of the invention (4) (Please read the precautions on the back before filling this page The measurement of the static angle is carried out by passing the powder sample through a screen with a diameter of 8 mm and a mesh opening of 7 10 / zm under the screen vibration, and slowly passing the sieved sample from a height of 160 mm Funnel drops to 80 mm diameter When the angle between the production line of the cone formed by the powder and the horizontal plane is generated, take a smaller value based on the higher flowability. Measure the amount of powder falling until the angle of rest is generally stable. The flowability index 値 is a judgment criterion for digitally evaluating the flooding characteristics. By determining the flowability index 测量, the drop angle, the difference angle, and the dispersibility measured from Tables 5 and 6, the flowability index 値 is defined In order to aggregate the Tannian indices: a larger 値 corresponds to a higher flowability characteristic. Now the definition of individual physical properties will be explained. The liquidity index is determined by an index determined in a similar manner. From the measurement angle of rest angle, compressibility, spatula angle, and coefficient of consistency, and expressed as the sum of these indices. The angle of rest is determined in the manner described above. The compressibility is defined as: (the overall density of the filling-the overall density of ventilation) / the total density of the filling X 1 ◦ ◦ The overall density of ventilation printed by the employee consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs is determined by shaking the screen The powdery sample is passed through a sieve with a diameter of 8 mm and a mesh opening of 7 1 0, and the powder under the sieve is packed in a container with an internal volume of 100 m3 as the measured powder mass. . The method of determining the overall density of the filling is to pat the container containing the powder, and take a shot at 180 times' over a time period of 180 seconds and measure the mass corresponding to a volume of χ 〇 〇 c m 3. The size of the paper is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297). 472125 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (5) The method of determining the knife angle is to use metal A prepared spatula with a size of 120 × 2 2 mm was kept horizontal and the inclination angle of the powder side surface accumulated on it was measured. Consistency is defined as the cumulative mass distribution obtained from the particle size distribution measured by sieve analysis, divided by 60% of the cumulative undersize distribution divided by the cumulative smaller size distribution1値 with a particle size at 0%. The particle size distribution can be determined by different methods, such as sieve analysis and laser diffraction scattering methods, which can reflect the particle size of the powder to be measured and the like. The 値 ′ measured by the laser diffraction scattering method of the present invention is measured using a “Microtrack F R A 9 2 2 0” manufactured by Nikkiso Co., Ltd. The method of determining the drop angle is to apply a fixed impact force to the powder cone formed for the purpose of measuring the angle of rest with a vibrator attached to the measuring instrument, and measure the tilt of the cone formed by the fall. angle. The difference angle is determined by subtracting 値 from the drop angle from 静止 at the static angle. The dispersibility is determined by throwing a 10 g powder sample at a time from 6 1 •........ Cm to a 10 cm diameter glass surface with a concave surface facing downward. The powder sample is scattered on The mass outside the glass is a percentage relative to the total mass of the powder sample that was dropped. Powder samples higher than this are usually highly dispersible and flowable. The sodium bicarbonate should preferably have an average particle size in the range from 2 // m to 3 0 // m. When the average particle diameter is larger than 30 #m, the reaction between the sodium-based dechlorinating agent and hydrogen chloride becomes insufficient; on the other hand, when the average particle diameter is smaller than 2 # m, it takes a lot of time and labor. In order to make the sodium-based dechlorinating agent, the paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) —M -------- Order -------- line (please read first Note on the back page, please fill in this page again) -8- 472125 A7 B7 V. Description of the invention (6) A sufficient response has been achieved. The average particle size can meet the demand within the range of 2 # m to 3 0 # m. 2 // m to 1 0 #m can have a higher response (please read the precautions on the back before filling this page), so it is more recommended. Available anticaking agents typically include silicone, magnesium stearate, calcium stearate, and magnesium carbonate. The hydrophilic anti-caking agent in the present invention should preferably contain silicone, and more preferably should be mixed in the total mass of the dechlorinating agent in an amount of 0.1% or more. An amount of less than 0.1% is not sufficient to obtain an anti-caking effect. Because the hydrophilic anti-caking agent does not dissolve in water, it takes a considerable amount of time and labor to dispose of the dechlorination residue. Therefore, the hydrophilic anti-caking agent should preferably be 0.1% to An amount in the range of 5% is mixed in the total mass of the dechlorinating agent. Furthermore, the average particle size of the hydrophilic anti-caking agent should preferably be in the range of 0.0 0 1 # m to 1 # m. A smaller average particle size will have a more prominent anti-caking effect, but it is not technically easy to make the particle size of the powder less than 0. 0 0 1 # m in a low-cost 'industrialized manner; the average particle size is greater than 1 m There will be less anti-caking effect. So it should be in the range of ◦. 0 ◦ 1 # m to 1 // m. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, the waste treatment equipment in the present invention includes a thermal cracking reactor, which thermally cracks waste to generate thermal cracking gas and thermal cracking residues mainly containing non-volatile components; a separation mechanism The pyrolysis residue is divided into flammable and non-combustible components; the combustion melting furnace can allow the pyrolysis gas and flammable components to be introduced for combustion, and the melting furnace stone and flue gas are discharged; the first flue gas processing mechanism is removed Dust in flue gas; the second flue gas processing agency applies the Chinese National Standard (CNS) A4 (210 X 297 mm) at this paper scale -9-Α7 Β7 V. Description of the invention (7) Since the first smoke The flue gas discharged from the flue gas treatment mechanism is dechlorinated by adding a dechlorinating agent; the separator adds water to the dechlorination residue generated by the second flue gas treatment mechanism, and The water-insoluble composition that is insoluble in water is separated from the aqueous solution of the dechlorination residue; the p Η modifier adjusts the ρ Η of the aqueous solution remaining after the water-insoluble composition is separated by the separator; and at least another Dioxin removal unit to remove dioxin residues from the second flue gas treatment mechanism and / or dioxin and the like from aqueous solutions whose ρ Η has been adjusted with ρ Η modifier; sodium The dechlorinating agent is added to the second flue gas treatment mechanism. As described above, the dioxin removal unit that removes dioxin and the like from the aqueous solution in which ρ Η has been adjusted by the ρ Η modifier can be provided as the dioxin removal unit. A dioxin removal unit capable of removing dioxin and similar dioxins in the dechlorination residue generated by the second flue gas treatment mechanism can be provided instead of the dioxin removal unit for dioxin removal of the adjusted aqueous solution ρ Η. When a dioxin and similar dioxin removal unit is provided to remove the dechlorination residue generated by the second flue gas treatment mechanism, the dioxin removal unit can almost completely remove dioxin and the like, but it is not removed for removal. Dioxin and the like, the second dioxin removal unit may be provided downstream of the P (R) modifier. By using a chelating resin or a chelating agent (hereinafter collectively referred to as "chelating substance J"), it is possible to remove the TTTT left in the aqueous solution after separating the water-insoluble composition. Water ° Furthermore, it can be treated in the above waste The upstream of the second flue gas treatment mechanism in the equipment is mixed with sodium bicarbonate and hydrophilic anti-caking agent. The paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) (Please read the note on the back first) Please fill in this page for further information.) Packing — Order II ------- I-line Consumer Consumption Cooperation of Intellectual Property Bureau of the Ministry of Economics Du printed-10- Printed by the Employee Consumption Cooperative of Intellectual Property Bureau of Ministry of Economic Affairs 472125 Α7 _____ Β7 V. Invention The mixer of (8) and the honing machine for honing sodium bicarbonate. The p Η modifier can be added downstream of the p Η modifier in the waste treatment equipment described above, which has been adjusted by the p 改性 modifier. Mercury in aqueous solution. The method in the flue gas dechlorination method of the present invention comprises the steps of adding the above-mentioned sodium-based dechlorinating agent to the flue gas, so that the hydrogen chloride contained in the flue gas and the sodium-based dechlorinating agent Reaction to remove it. Furthermore, this The method for dechlorination of flue gas in the Ming Dynasty includes the following steps: reacting hydrogen chloride contained in the flue gas with a sodium-based dechlorinating agent to remove the residue of dechlorination; removing dioxin and the like from the dechlorination residue; Then, water is added to dissolve the dechlorination residue, and a water-insoluble composition that cannot be dissolved in water is separated from the aqueous solution in which the dechlorination residue is dissolved; and P 对 is adjusted for the aqueous solution remaining after the water-insoluble composition is separated. In the gas dechlorination method, dioxin and the like that cannot be completely removed can be removed again after the adjustment of ρ 。. Brief description of the figure: Figure 1 is a schematic diagram of the system, illustrating that the sodium-based dechlorinating agent method of the present invention can be used for dechlorination. An example of a chlorine device. Figure 2 is a schematic diagram of the system, illustrating another example of a dechlorination device that can be performed with the sodium-based dechlorinating agent method of the present invention. Figure 3 is a schematic diagram of the system, still illustrating the sodium-based dechlorinating agent of the present invention Method, another example of a dechlorination device can be performed. FIG. 4 is a schematic diagram of the system, illustrating another example of a dechlorination device that can be performed with the sodium-based dechlorinating agent method of the present invention. The dimensions are applicable to China National Standard (CNS) A4 (210 X 297 mm) I ^ -------- Order --------- Line- (Please read the precautions on the back before filling in this Page) -11-472125 A7 B7 V. Description of the invention (9) Figure 5 is not intended to illustrate the system. 'Describes another example of the dechlorination device that can be performed with the sodium-based dechlorinating agent method of the present invention. Figure 6 is a schematic diagram of the system' A waste treatment equipment is described as another example of the present invention. Comparison of main components 2 Thermal cracking reactor 4 Separator 5 Honer 6 Combustion melting furnace 8 Heat exchanger 10 Waste heat boiler 12 Cooling tower 14 First episode Dust collector 16 Second dust collector 18 Honer 2 0 Flue 2 2 Dissolution tank 2 4 Relay tank 2 6 Separator 2 8 p pAdjustment tank 32 Dioxin removal unit 32a Dioxin removal unit 3 4 Wastewater tank (please read first Note on the back then fill out this page) !! _ —Order --------- Printed by the Consumers' Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. The paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) -12- 472125 A7 B7 V. Description of the invention (ίο) Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 3 5 Mixer a Waste b Thermal cracking residue c Thermal cracking carbon d 1 Valuable articles d 2 Residue e Melting furnace stone f 1 Dust f 2 Dust f 3 dust g dechlorination if g 1 sodium bicarbonate g 2 hydrophilic anti-caking agent A hot air G 1 pyrolysis gas G 2 combustion flue gas G 3 flue gas G 4 flue gas G 5 flue gas G 6 Flue gas G 7 Flue gas h Dechlorination residues i Water j Aqueous solution (please read the precautions on the back before filling this page) Loading -------- Order --------- The paper size of the paper is applicable to the Chinese National Standard (CNS) A4 (210 X 297 mm) -13- 472125 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (11) k Water-insoluble composition w Water Detailed description of preferred specific examples: Specific examples of the present invention will be described with reference to the drawings. Fig. 1 is a schematic diagram of a system capable of performing a dechlorination device by the sodium-based dechlorinating agent method used in the present invention. This example represents the application of the present invention to the flue gas dechlorination of, for example, the flue gas G5 produced on the flue. As shown in FIG. 1, the flue thermal dechlorination device includes a first dust collector 1 4 ′ as a first flue gas processing mechanism and a second dust collector 16 as a second flue gas processing mechanism to perform Two-stage dust collection. The flue gas G 5 is produced when the processed waste is sent to the first dust collector 14 & 'the first dust collector 1 4 removes the dust from the flue gas G 5 (incineration fly ash) ί 1' The flue gas G 6 from which the dust f 1 has been removed is sent to the second collector 16 ′. At this time, the sodium-based dechlorinating agent g of the present invention is added to the flow channel in the upstream of the second dust collector 16. Because the dust f 丨 has been removed in the first dust collector 14 in advance, the dechlorination residue h in the second dust collector 16 is almost free of dust f 1. As a result, compared with the case of a single dust collector 'This dechlorination residue h is easier to dispose of. The sodium-based dechlorinating agent g contains a mixture of sodium bicarbonate (sodium bicarbonate: Na H C 0 3) and a hydrophilic anti-caking agent. Sodium bicarbonate should be honed to an average particle size in the range of 2 // m to 3 〇 # m, or preferably 2 # m to 1 0 // m ′ and in an amount of 0.1% by mass or more Mixed with silicone-based hydrophilic anti-caking agent, or preferably in the range of 0.1 mass% to 5 mass%. This paper size is applicable to China National Standard (CNS) _A4 specifications (210 X 297). (Please read first Note on the back, please fill in this page again.) Assemble !! Order --------Line -14- 472125 Consumer Co-operation of Intellectual Property Bureau of the Ministry of Economic Affairs Du printed A7 B7 5. Inventory (12). The average particle diameter of the hydrophilic anti-caking agent should be in the range of Q. 0 0 1 // m to 1 / zm, or preferably in the range of 0. 00 1 // m to 0.1 μm. Available hydrophilic anti-caking agents include, for example, fumed hydrophilic silicone manufactured by Tokuyama Corporation. When the sodium bicarbonate particles are honed to a particle size ranging from 2 # m to 3 0 # m, the reaction goes from the particle surface to the inside, and the small particle size ensures good adhesion to the filter cloth and satisfactory utilization efficiency. When the flue gas contains sulfur oxides, the sodium-based dechlorinating agent g can be used as a desulfurizing agent, making it possible to complete desulfurization in the second dust collector 16 while dechlorinating. When sodium-based dechlorinating agent g is added, sodium chloride (Na C 1) produced by reaction with hydrogen chloride (HC 1) contained in the flue gas is discharged from the second dust collector 16 as a dechlorination residue. The dechlorinated flue gas G 7 is emitted from the flue 20 as a purified gas. On the other hand, the dechlorination residue h removed by the second dust collector 16 is added with water i and dissolved in the dissolution tank 22, and further sent to the relay tank 24, and stored as an aqueous solution j. When water i is added, the water-soluble composition in the dechlorination residue h is dissolved in water, but the water-insoluble composition k is insoluble in water and becomes a suspended substance in the aqueous solution. Then, the produced aqueous solution j is sent to a separator 26, which is separated by, for example, filtration, and the water-insoluble composition k which forms a suspension is separated from the aqueous solution. The separated water-insoluble composition k is returned to a thermal cracking reactor (not shown) as described later, and finally melted in a combustion furnace. After being converted into a molten furnace stone, it is discharged outside the system. At this time, dioxin and the like in the water-insoluble composition k can be decomposed and completely removed in a combustion melting furnace. This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) 』-15--------- ^ --------- ^ (Please read the notes on the back first (Fill in this page again) 472125 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the invention (13) The remaining water solution 1 after separating the water-insoluble composition k contains water-soluble composition 'Send it to the next adjustment P Η Ρ Η is adjusted in the program of the slot 2 8. A pH adjusting agent such as hydrogen chloride (H C 1) acidic substance is added to neutralize the unreacted dechlorinating agent dissolved in water. Furthermore, dioxin and the like sent to the dioxin removal unit can be removed. In order to remove dioxin and the like ', an aqueous solution is passed through a packed bed of activated carbon or the like, and an activated carbon adsorption method for removing dioxin and the like is used. The aqueous solution 1 obtained by removing dioxin from the remaining aqueous solution 1 described above is stored in a wastewater tank 34 as treated water w. Among the above water-soluble compositions, only aqueous solutions containing soluble sodium salts such as sodium chloride are adjusted to ρ Η before being discharged to the ocean, rivers and sewage disposal sites. As for the minor content of dioxin, dioxin and the like in the aqueous solution 1 are removed only after separation of the water-insoluble composition. This method is simpler and less expensive than a thermal cracking device. As shown in FIG. 1, in order to remove dioxin and the like contained in the aqueous solution 1 remaining from the separator 2 6, a dioxin removal unit 3 2 is provided downstream of the ρ Η adjustment tank 2 8. Diol and similar in chlorine residue h. More specifically, as shown in FIG. 2, the dioxin removal unit 3 2 a is arranged between the second dust collector 16 and the dissolution tank 22, so that the dechlorination residue h from the second dust collector 16 Dioxin and the like contained in the dechlorination residue h are removed before being dissolved in water. A dioxin removal unit 32a which can be used includes, for example, a thermal dechlorination unit. The characteristic 'Dioxin and the like described above can be almost completely removed from the dechlorination residue discharged from the dioxin removal unit 32a. Therefore, not only the water-insoluble composition k, but also the remaining aqueous solution 1, almost the size of this paper applies Chinese National Standard (CNS) A4 specifications (210 X 297) (please read the precautions on the back before filling in this Page) " -------- Order --------- line | -16- 472125 A7 B7 V. Description of the invention (14) Contains dioxin or the like. (Please read the precautions on the back before filling in this page.) Furthermore, the characteristics shown in Figure 3 can also be used, in which the dioxin removal unit 3 2 is arranged downstream of the P Η adjusting groove 28 and the dioxin removal The unit 3 2 a is arranged between the second dust collector 16 and the dissolving tank 2 2. That is, dioxin and the like can be almost completely removed by the dioxin removal unit 3 2 a. If there is a problem that dioxin and the like remain after removal, the dioxin removal unit 32 can still completely remove dioxin and the like after the adjustment of PP. Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs can also adopt the characteristics shown in Figure 4, where the setting mechanism of the mixer 35 and the honing machine 18 is honing sodium bicarbonate and mixed hydrophilic anti-caking agent. Generally, because sodium bicarbonate g 1 has an average particle size in the range of 50 / zm to 2 7 0 // m, the steps included in the program include: 0.1% by mass of sodium bicarbonate g 1 Amount, add a hydrophilic silicone with an average particle size in the range of ◦. 0 0 1 // m to 1 Μ IB, as a hydrophilic anti-caking agent g 2; in a mixer 3 5 mix sodium bicarbonate g 1 and Hydrophilic anti-caking agent g 2; honing the resulting mixture in a honing machine 18 so that the average particle size is in the range of 2 μm to 3 0 // m to produce a sodium-based dechlorinating agent g. This sodium-based dechlorinating agent g is added to the flue gas G6, and the powder 麈 f1 thereof has been removed by the first dust collector 14. Because the size of sodium bicarbonate honing to an average particle size in the range of 2 # m to 3 0 # m is small, it will react from the particle surface to the inside, and has good adhesion properties to the filter cloth of the bag dust collector . Therefore, satisfactory utilization efficiency can be ensured. As shown in Figure 4, the Dioxin removal unit 3 2 is arranged downstream of the pH adjustment tank 28, and the Dioxin removal unit 3 2 a can also apply the Chinese National Standard (CNS) A4 specification to this paper size ( 210 X 297 mm) -17- 472125 A7 B7 printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (15) The characteristics shown in Figure 2 are arranged in the second dust collector 16 and the dissolution tank 2 Between 2. Furthermore, as shown in FIG. 3, the dioxin removal unit 3 2 may be disposed downstream of the P Η adjustment tank 28, and the dioxin removal unit 3 2 may be disposed at the second dust collector 16 and the dissolution tank 2. Between 2. As shown in FIG. 5, it is also possible to arrange a mercury removal unit 30 between the pH adjustment tank 28 and the dioxin removal unit 32, with the purpose of removing the water remaining from the separator 26, which is contained in the valley liquid 1. Dear. By using this characteristic, p of the aqueous solution 1 remaining after the water-insoluble composition k is separated by the separator 2 6 is adjusted in the p Η adjustment tank 2 8, and mercury belonging to a heavy metal can be removed by the mercury removal unit 30. Remove. Mercury can be removed, for example, by precipitation, ion exchange or adsorption. In the Shendian method, possible techniques include precipitation that produces a mercury sulfide form, or the use of heavy metal scavengers with dithiocarbamates and the like. In the ion exchange method, when mercury is present as an anion such as a halogenated complex ion, an anion exchange resin is used. In the adsorption method, a chelating resin, activated carbon, or activated coke having a high selectivity for a specific heavy metal is utilized by a chelating effect. Useful chelating resins include, for example, polypropylene, polystyrene, or phenol resins as the matrix, and types such as thiol, dithiocarbamate, isothuronium, diphenylthiosulfone, thiourea, or polyamine as the coordination free base. Useful activated carbon types include, for example, gas activated carbon, zinc chloride activated carbon, granular activated carbon, coconut shell activated carbon, and granular activated carbon black. Among these methods, a method using a chelating substance such as a chelating agent or a chelating resin is preferable because it is simple and accurate. The mercury-removed aqueous solution is introduced into the dioxin removal unit 3 2 and the Chinese national standard (CNS) is applied at this paper scale. A4 size (210 X 297 mm) (Please read the precautions on the back before filling this page) I installed! Order--I--! 1 · Line · -18- 472125 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of Invention (16) Remove dioxin and the like. The applicable dioxin removal method is the same as the one shown in Fig. 1 above. In FIG. 5, the 'dioxin removal unit 32 is disposed downstream of the pΗ adjustment tank 28 located downstream of the mercury removal unit 30. However, as shown in FIG. 2, the dioxin removal unit 3 2 a may be disposed between the second dust collector 16 and the dissolution tank 22. Furthermore, as shown in FIG. 3, the dioxin removal unit 32 is disposed downstream of the pΗ adjustment tank 28, and the dioxin removal unit 3 2a may be disposed between the second dust collector 16 and the dissolution tank 22 between. A waste treatment apparatus for treating waste and the generated flue gas will now be described with reference to FIG. Fig. 6 is a schematic diagram of a system illustrating an example of a waste disposal apparatus according to the present invention. As shown in FIG. 6, in this waste treatment equipment, the waste a of municipal waste is honed below 150 mm 2, and then introduced into the thermal cracking reactor 2 by an introduction mechanism such as a screw feeder. . For example, a horizontal rotary drum is used as the thermal cracking reactor 2. The interior of the thermal cracking reactor 2 is maintained in a low-oxygen environment by a sealing mechanism (not shown), and heat exchange is arranged downstream of the combustion melting furnace 6. The hot air A in the downstream heated by the heater 8 is introduced from the line L 1. The waste a leading to the thermal cracking reactor 2 is heated with hot air A to a temperature in the range of 30 ° to 600 ° C, or usually about 4500 ° C, so that the waste a is thermally cracked. A thermal cracking gas G1 and a non-volatile thermal cracking residue b are generated. The thermal cracking gas G 1 and thermal cracking residue b generated in the thermal cracking reactor 2 are separated by a discharge unit (not shown). The thermal cracking gas G 1 is transported via a line L 2, which is a thermal cracking gas. The paper size of this paper applies to China National Standard (CNS) A4 (210 X 297 mm) I! ----- · " 1--Order ------- line (please read the precautions on the back first) (Fill in this page again) -19- 472125 A7 B7 printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of the invention (17) The pipeline to the burner of the combustion furnace 6. According to the findings obtained by the present inventors, the thermal cracking residue b, which changes with the type of waste a, can be found to contain the following mass%: most of the flammable components relatively contain fine particles: 10 to 6 0% relatively fine ash: 5 to 40% coarse metal granules: 7 to 50% coarse residue, ceramics, cement, etc .: 10 to 60% at a relatively high temperature of about 4 5 0 t The discharged thermal cracking residue b is cooled to about 80 ° C. in a cooling unit (not shown in the figure) and is introduced into the separator 4 as a separation mechanism, where the residue is divided into pyrolytic carbon of a combustible composition c, and non-combustible valuable plutonium article d 1 and residue d 2. Vibrating screens, magnetic separators, and aluminum separators can be used as the separator 4 as well as known separators. The thermally cracked carbon c and the residue d 2 separated from the non-combustible components and then discharged are honed by a rolling type, a tube type, a rod type, or a ball type type honing machine 5 and then sent to a combustion melting furnace 6. The honing machine 5 is appropriately selected according to the type and characteristics of the waste. In the honing machine, the pyrolyzed carbon c and the residue d 2 should preferably be honed to a particle size of 1 mm or less, and then sent to the burner of the combustion melting furnace 6 through the line L 3. On the other hand, the combustion air, thermally decomposed gas G1, and thermally cracked carbon c delivered by a fan (not shown) are burned in a combustion melting furnace at a temperature in a high temperature range of about 130 ° C. After this combustion, the burning ash produced by the relatively fine ash particles of pyrolysis of carbon c and residue d 2 will melt. This paper is sized to the Chinese National Standard (CNS) A4 (210 X 297 mm) 1 ---- ------ Ί! Β --------- ^ I (Please read the notes on the back before filling this page) -20- 472125 A7 B7 V. Description of the invention (18) (Please read first Note on the back? Matters need to be filled out on this page again) to produce melting furnace stone e. The hearth stone is thrown into the water tank (not shown) from the bottom outlet of the hearth of the combustion melting furnace 6, and the melting hearth e is converted into a water-based granulated hearth. An apparatus (not shown) is used to restrict the water-granulated hearthstone to a specified shape, or to make it into reusable building materials or paving materials. The combustion flue gas G 2 generated in the combustion melting furnace 6 of the waste treatment facility is heat-recovered in the heat exchanger 8 to become the flue gas G 3, which is introduced into the waste heat boiler 10 which can recover heat, The flue gas G 3 is transformed into a flue gas G 4. The flue gas G 4 is sent to a cooling tower 12 to reduce its temperature. The flue gas G 5 that has been cooled in the cooling tower 12 is sent to the first dust collector 1 4. The dust f 2, f 3 and f 1 are collected in the waste heat boiler 10, the cooling tower 12 and the first dust collector 14 respectively. With the pyrolysis carbon c separated in the separator 4, the gas passes through the line L 3 And L 4 is returned to the burner of the combustion melting furnace 6, and is burned and melted in the combustion melting furnace 6 to become a furnace stone. The consumer cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs printed the water-insoluble composition k separated by the separator 2 6 and returned to the thermal cracking reactor 2 via the line L 5, and finally burned and melted in the combustion melting furnace 6 to become a furnace stone. In this procedure, heavy metals are rendered harmless by forming hearthstone. The subsequent processing of the flue gas G 5 sent to the first dust collector 14 is the same as that shown in Fig. 5, so its explanation is omitted here. The subsequent processing of the flue gas G 5 sent to the first dust collector 14 can be performed using a processing system having the characteristics shown in Figs. Examples The sodium-based dechlorinating agent of the present invention was used for practical experiments. Hydrophilicity This paper is sized for China National Standard (CNS) A4 (210 X 297 mm) -21-472125 A7

Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs. 5. Description of the invention (19) The anti-caking agent is mixed with the sodium-based dechlorinating agent of the present invention (hereinafter referred to as "sodium-based dechlorinating agent A"). For comparison purposes, In addition, a sodium-based dechlorinating agent is mixed with a hydrophobic anti-caking agent instead of a hydrophilic anti-caking agent (hereinafter referred to as "sodium-based dechlorinating agent B"), and its practical application experiment is also performed. Sodium-based dechlorinating agent A contains sodium bicarbonate having an average particle size of 8 # m, and a hydrophilic fumigant silicone gel having an average particle size of 0.03 as an anti-caking agent. The amount was 1% by mass. The sodium-based dechlorinating agent b contains sodium bicarbonate having an average particle diameter of 8 // m, and a hydrophobic fumigant silicone mixed with an average particle diameter of 0 · 〇1 3 // m as an anti-caking agent. It is 1% by mass. The different data for the anti-caking agent added to the sodium-based dechlorinating agent A and B are shown in Table 1. In Table 1, the anti-caking agent A and the anti-caking agent b respectively represent the addition to the sodium-based dechlorinating agent A. And anti-caking agent in sodium-based dechlorinating agent B. ^ -------- Order --------- Line (Please read the precautions on the back before filling this page) Table 1 Anti-caking agent A Anti-caking agent B Kind of hydrophilic and hydrophobic Name fumed Fumed sand glue manufacturer TOKUYAMA company TOKUYAMA company product name REOLOSIL QS-102 REOLOSIL MT-10 Addition amount 1% by mass 1% by mass Particle size 0.014 μm 0.013 μm Chemical composition Silicone (Si〇2) Silicone (Si 〇2) $ Paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) -22- 472125 A7 __B7 _____ V. Description of the invention (2〇) (Please read the precautions on the back before filling this page) Based on the sodium-based dechlorinating agents A and B to which the anti-caking agent has been added, the rest angle, flowability index and dispersibility are determined. The powder tester PT-D manufactured by Hosokawa Micron was used for analysis by the above-mentioned measurement method. The measurement of the rest angle of the sodium-based dechlorinating agent A in this example was 5 3 °, the dispersibility was 21%, and from Tables 5 and 6, it was read that the rest angle index was 12 and the dispersibility was 16. Similarly, the measurement of other items gives a floodability index 値 of 7 4 and the results suggest that it has a high floodability. The same evaluation was performed for the sodium-based dechlorinating agent B, which showed that the floodability index 値 was 90, and the result was suggested to have a high floodability. The results are shown in Table 2. Table 2 Sodium-based dechlorinating agent A Sodium-based dechlorinating agent B Measurement 値 Index measurement 値 Index rest angle Γ) 53 12 38 18 Dispersibility (%) 21 16 57 25 Flowability Index — 74 — 90 Ministry of Economy Wisdom Printed by the Consumer Cooperative of the Property Bureau, comparing sodium dechlorinating agent A and sodium dechlorinating agent B, the following findings were obtained. As far as the characteristics of the powder, sodium dechlorinating agent A shows a general flowability similar to the consumption of hydroxide It is easy to mix with water; sodium-based dechlorinating agent B shows high flowability, it will repel water and cannot adapt to water. In order to know the practical applicability, the bag dust collector used in the actual factory can be applied to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) at this paper standard. -23- 472125 Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs System A7 B7 V. Description of the invention (21) Operational experiment, the results are shown in Table 3. Both sodium-based dechlorinating agents A and B use Teflon-laminated double-woven glass cloth filter cloth, because the Teflon-laminated peeling can be observed on some of the filter cloths, and the sodium-based dechlorinating agent B is the agent The amount of leakage is large. Table 3 Sodium-based dechlorinating agent A Sodium-based dechlorinating agent B Type of filter cloth Iron fluoride ion-laminated iron fluoride ion-laminated filter cloth pressure drop M. 9 × 10 2 Pa 2x103 Pa or more agent leakage < lmg / Nm3 Less < 120mg / Nm3 or less As far as the sodium-based dechlorinating agent A is concerned, the pressure drop of the cloth is very low, up to 4.9xl02Pa, and the leakage of the self-filtering cloth is up to img / Nm3, so it will not Cause practical problems. Conversely, with regard to sodium-based dechlorinating agent B, the pressure drop of the filter cloth is very high, reaching 2 x 1 0 3 P a, and the self-filter cloth also has a high and shallow leak weight of 1 2 Omg / Nm3 'so it is not consistent. Difficulties in international application. The leakage concentration and pressure drop experiments were performed using a double woven glass cloth alone as a filter cloth and a double woven glass cloth with a Teflon layer on the surface as a filter cloth. The results are shown in Table 4. This paper size is applicable to China National Standard (CNS) A4 (21〇X 297 mm) ^ Μ -------- ^ ----------- ^ (Please read the notes on the back before filling in (This page) -24- A7 '^^ -------- B7 V. Description of the invention (22) —_ 4 ----_ Sodium-based dechlorinating agent A Sodium-based dechlorinating agent B Double woven glass Cloth leakage concentration (mg / Nm3) ___ Pressure drop (Pa) 0 4, 102 1 5000 8.5χ102 Leak concentration of double woven glass cloth + Teflon laminate 0 0 (mg / Nm3) Pressure drop (Pa) 1.8χ 102 7.5χ102 (Please read the notes on the back before filling out this page) Printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs When the double-woven glass cloth is used alone, the leakage concentration and pressure for sodium-based dechlorinating agent B Both drops are large; but for sodium-based dechlorinating agent A, both the leakage concentration and the pressure drop are small. In the case of using a double-woven glass cloth having a Teflon coating on the surface, there was no leakage concentration for both sodium-based dechlorinating agents A and B, but the pressure drop of sodium-based dechlorinating agent B was large. This paper size applies the Chinese National Standard (CNS) A4 specification (21〇 x 297mm) -25- 472125 A7 B7 V. Description of the invention (23) # 1 美食 ， $ (I) c〇

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Q6-S §§ | Bu (3) ¾ S inch inch inch-CN inch cicada rose I inch delete? iMIlg! 69-09 (S Lai_ ς ς lolz. Inch 9 Inch S9 Inch 9-Bu 5 95 06 S-A9 99 ¥ 扉 ^ $, 00 Cruze ΑΕΜ am 62 Inch osco.s 61-0 (Blp from (¾ o) · The paper size of Suben is applicable to Chinese National Standard (CNS) A4 (210 χ 297 mm) -26- 472125 A7 B7 V. Description of the invention (24 Printed cough urine # 1 by the Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs ®, f? S 伥 9 to 9 dispersibility index 25 23 22.5 22 21 20 19.5 18 17.5 17 16 15 £ > 50 49-44 43 42 41-36 35 34 33-29 28 27 26-21 20 Angle of difference Index 25 24 22.5 22 21 20 • OO _ · Ο »vn 'I C' '' · 'r—H i < > — < i 1 ί 1 > 30 29-28 27 26 25 24 23 22- 20 19 18 17-16 15 Drop angle index 25 24 22.5 22 21 20 19.5 18 17.5 17 16 15 10 11-19 20 21 22-24 25 26 27-29 30 31 32-39 40 Fluidity index 25 24 22.5 22 21 20 ^ OO IT ^ · < 0 ^ T—H IT ^ · r— (r—ir— (i 1 i < (index derived from the above table) > 60 59-56 55 54 53-50 49 o oo 'inch cn on inch Bu inch inch CO inch inch preventive measures need rotary seals need rotary seals floodability index 80-100 60- 79 Flowability is very high r (A) High (B) This paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm). Packing -------- Order ------ --- 绫 (Please read the notes on the back before filling this page) -27- 472125 A7 B7 V. Description of the invention (25) As mentioned above, according to the present invention, the sodium bicarbonate is calcined and reacted with hydrogen chloride. Granules or granules of the anti-caking agent will not get stuck in the filter cloth attached to the dust collector, so it can avoid granules caused by sodium bicarbonate calcination and reaction with hydrogen chloride, or anti-caking The granules of the blocking agent block the filter cloth. It may prevent the pressure drop in the filter cloth. The granules caused by the calcination of sodium bicarbonate and the reaction with hydrogen chloride, or the granules of the anti-caking agent will not It is stuck in the filter cloth attached to the dust collector, and the particulate matter caused by the sodium bicarbonate calcination and the reaction with hydrogen chloride or the anti-caking agent will not enter the downstream through the filter cloth. Leakage of chlorine agent. (Please read the precautions on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs This paper applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) -28-

Claims (1)

472125 Printed clothing A8 B8 C8 D8 by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs 6. Application for patent scope 1. A sodium-based dechlorinating agent containing a mixture of sodium bicarbonate and a hydrophilic anti-caking agent with a static angle of at least 40 °, dispersion less than 50, and floodability index 値 less than 90. 2. The sodium-based dechlorinating agent according to item 1 of the scope of the patent application, wherein the sodium-based dechlorinating agent has an average particle size in the range of 2 # m to 30 # m. The sodium-based dechlorinating agent of the item 'wherein the hydrophilic anti-caking agent contains silicone, and 0.1% by mass or more of the hydrophilic anti-caking agent is mixed. 4. The sodium-based dechlorinating agent according to item 1 of the patent application range, wherein the sodium bicarbonate has an average particle size in the range of 2 // m to 3 0 # m 'The hydrophilic anti-caking agent contains silicone And mixed with 0.1% by mass or more of the hydrophilic anti-caking agent. 5. The sodium-based dechlorinating agent according to item 1 of the scope of the patent application, wherein the hydrophilic anti-caking agent has an average particle diameter in a range of 0.0 0 1 # m to 1 // ηι. 6. A waste treatment equipment comprising: a thermal cracking reactor which thermally cracks waste to generate a thermal cracking gas and a thermal cracking residue mainly containing a non-volatile composition; a separation mechanism divides the thermal cracking residue into a combustible composition And non-combustible components; the combustion and melting furnace can allow the pyrolysis gas and combustible components to be introduced for combustion and discharge the molten furnace stone and flue gas; the first flue gas processing mechanism removes dust from the flue gas; The second flue gas processing mechanism adds a dechlorinating agent to the flue gas discharged from the first flue gas processing mechanism to dechlorinate it; the separator adds water to the paper size of the paper by the second flue gas processing mechanism. Applicable to China National Standard (CNS) A4 (210 X 297 mm) Z One * -29- 敕 -------- Order --------- Line '-(Please read the Note: Please fill in this page again.) 472125 Printed by A8, B8, C8, D8, Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. 6. The dechlorination residues produced in the scope of patent application are separated from the aqueous solution containing the dechlorination residues dissolved in it. Non-water-soluble Composition; ρ η modifier adjusts the ρ Η of the aqueous solution remaining after the insoluble composition is separated by the separator; and at least another dioxin removal unit to remove dechlorination residues from the second flue gas treatment mechanism And / or dioxin and the like derived from an aqueous solution whose ρ Η has been adjusted with a ρ Η modifier; a sodium-based dechlorinating agent containing a mixture of sodium bicarbonate and a hydrophilic anti-caking agent, which has The rest angle is 40. Or more, the dispersibility is less than 50, and the floodability index 値 is less than 90, as the dechlorinating agent, and added to the second flue gas treatment mechanism. 7. The waste treatment equipment according to item 6 of the patent application range, wherein the sodium bicarbonate has an average particle size in a range of 2 V m to 30 m. 8. The waste treatment equipment according to item 6 of the scope of patent application, wherein the hydrophilic anti-caking agent contains silicone, and 0.1% by mass or more of the hydrophilicity is mixed in the sodium-based dechlorinating agent. Anti-caking agent. 9. The waste treatment equipment according to item 6 of the patent application, wherein the sodium bicarbonate has an average particle diameter in the range of 2 // m to 3 0 // m, and the hydrophilic anti-caking agent is silicon An anti-caking agent is added, and in the sodium-based dechlorinating agent, 0.1% by mass or more of the hydrophilic anti-caking agent is mixed. 10. The waste treatment equipment according to item 6 of the scope of patent application, wherein the hydrophilic anti-caking agent has an average particle size in the range of 0.001 / 1 m to 1 #m. 1 1. If the waste treatment equipment in item 6 of the scope of patent application, the paper size of this paper applies to the Chinese National Standard (CNS) A4 specification (210 X 297 public love) ^ -------- Order ----- ---- Line (Please read the precautions on the back before filling this page) -30- Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 472125 A8 B8 C8 Γ) 8 6. This device has a record removal unit in the scope of patent application In order to remove the mercury contained in the remaining aqueous solution after separating the water-insoluble composition. 1 2 · The waste treatment equipment according to item 6 of the patent application scope, wherein the equipment has a mixer 'to mix the sodium bicarbonate and the hydrophilic anti-caking agent, and a honing machine capable of honing sodium bicarbonate . 1 3. The waste treatment equipment according to item 10 of the scope of patent application, wherein 'sodium bicarbonate is honed in the honing machine to an average particle diameter in a range of 2 // m to 30 # m. 14. The waste treatment equipment according to item 6 of the scope of patent application, which includes a mercury removal unit provided downstream of the p Η modifier to remove mercury in an aqueous solution whose ρ ρ has been adjusted by the ρ Η modifier. . 15. A method for dechlorinating flue gas, comprising the step of adding a sodium-based dechlorinating agent containing a mixture of sodium bicarbonate and a hydrophilic anti-caking agent, the sodium-based dechlorinating agent having a rest angle of 40 ° or more It has a large dispersion, less than 50, and a floodability index 値 less than 90. 16. The method for dechlorinating flue gas according to item 15 of the scope of patent application, wherein the sodium bicarbonate has an average particle size in a range of 2 # m to 3 0 // m. 17. The method for dechlorinating flue gas according to item 15 of the scope of patent application, wherein the hydrophilic anti-caking agent contains silicone, and 0.1% by mass or more of the sodium-based dechlorinating agent is mixed. The hydrophilic anti-caking agent. 18. The method for dechlorinating flue gas according to item 15 of the scope of patent application, wherein the sodium bicarbonate has an average particle diameter in the range of 2 # m to 3 0 // m, and the hydrophilic anti-caking The agent is a silicon-based anti-caking agent ', and the Chinese national standard (CNS) A4 specification (210 x 297 meals) is applicable to the sodium paper size. _ * -------------- ^ --------- Order --------- line (please read the notes on the back before filling this page) 472125 A8 B8 C8 D8 VI. Mixing in the scope of patent application dechlorination agent 〇1 mass% or more of the hydrophilic anti-caking agent g 〇 1 9. The method for dechlorination of flue gas according to item 15 of the patent application scope, wherein the average particle size of the hydrophilic anti-caking agent is The diameter is in the range of 0. 0 0 1 # m to 1 // m. 20. The method for dechlorinating flue gas according to item 15 of the scope of patent application, comprising the following steps: reacting the hydrogen chloride contained in the flue gas with a sodium-based dechlorinating agent to remove the residue of dechlorination; Remove dioxin and the like from the dechlorination residue, then add water to dissolve the dechlorination residue, and separate the insoluble composition that is insoluble in water from the aqueous solution in which the dechlorination residue is dissolved; and Adjust the P P under the aqueous solution. 2 1. If the method for dechlorination of flue gas in item 2 of the scope of patent application is applied, dioxin and the like remaining after the removal can be removed again after adjustment of PΡ. »Install ---- I ---- Order --------- Line-ί Jing first read the notes on the back before filling out this page) Printed on paper scales applicable to employees' cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs China National Standard (CNS) A4 (210 X 297 mm) -32